The glass performance based on the shading coefficient and light transmittance, compare 13 types of glass from Asahimas manufacture for clear, green, blue green and dark blue glasses. The comparison result given as follow :

Picture 1.1 Shading coefficient perfomance

Based on shading coefficient performances, there are four categories which refer to four ranges of SC that are 0.30 – 0.39 , 0.40 – 0.49, 0.50 – 0.59 and > 0.60. The type of the glasses that are included to each categories are given here.

Table 1.1 Shading coefficient perfomance

SC CATEGORY

TYPE OF GLASSES

SHADING COEFFICIENT

LIGHT TRANSMITTANCE

0.30 -0.39

Stopsol Classic Dark Blue

0.34

0.21

0.40 -0.49

Stopsol Classic Green

0.34

0.27

Stopsol Supersilver Dark Blue

0.43

0.35

Stopsol Supersilver Blue Green

0.43

0.39

Sunergy Blue Green (low e)

0.43

0.42

Sunergy Green (low e)

0.45

0.52

Stopsol Supersilver Green

0.45

0.48

0.50 -0.59

Panasap Dark Blue

0.57

0.48

Panasap Green

0.58

0.63

Panasap Blue Green

0.59

0.56

> 0.60

Sunergy Clear (low e)

0.68

0.67

Stopsol Supersilver Clear

0.76

0.62

Indoflot Clear

0.89

0.87

The stopsol classic darkblue and stopsol classic green have lowest SC (0.34) than others and lowest light transmittance (0.21 and 0.27) so they will block the natural lighting significantly.

In the second category (0.40-0.49) the stopsol supersilver blue green and the stopsol supersliver green are the optimum choices because their light transmittances are not to low (0.39 – 0.45) and not differ significantly with the light transmittance of sunergy blue green (0.42) but cheaper. The stopsol classic green and stopsol supersilver dark blue have under 0.36 of the light transmittances. But the sunergy green is the best choice in this category because its light transmittance that is highest (0.52) than others in this category.

In the next category (0.50-0.59) the all glass indicate the similar shading coefficient but need to evaluate about the daylight performance. The final category have higher both shading coefficient and light transmittance and have to be located in the shaded areas.

Which category of SC that has to be chosen depends on the OTTV result. If the use of the higher SC still have OTTV value under 45 W/m2 then the next consideration is the optimum of light transmittance of the glass that caused by illumination level and glares.